Combine head and grep

[mister_bluesman]

Hi,

I have a file that I want to extract lines from if a pattern is found. However, I would also like to keep the first 5 lines even if that pattern does not appear in those lines.

For example: here is a file:

1
2
3
4

i a
i a
ii b
ii b
ii b
iii c

Now pretend I want the first 5 lines and lines containing 'b', then I want the following output:

1
2
3
4

ii b
ii b
ii b

Can anyone help?

Thanks.

[atreyu]

awk=head+grep (plus a bunch of other sh!t)

awk '/b/ || NR<6' yourfile.txt